Serial Recieve

Serial Recieve Routine with required startup conditions.
See Global Variables

#define NULL    0
#define BUFFLENGTH    64 // String recvbufer length.
 
#include <p18f452.h>
#pragma config WDT = OFF
 
//Global variables
volatile unsigned char recvbuf[BUFFLENGTH];
volatile unsigned char* recvbuf_iPtr;
volatile unsigned char* recvbuf_ePtr;
 
 
//Function Prototypes
void Setup(void);
void high_isr(void);
 
//Interrupt declaration.
#pragma code high_vector=0x0008
void interruptHigh(void)
{
    _asm GOTO high_isr _endasm
}
#pragma code
 
 
//****************************************************************
void main (void)
{
    recvbuf_iPtr = &recvbuf[0]; //initialise insertion pointer
    recvbuf_ePtr = &recvbuf[0]; //initialise removal pointer
 
    Setup();
 
 
    while (1)
    {
    // do nothing.
    }
}
 
 
 
void high_isr(void)
{
    INTCONbits.GIE = 0;    // Catch interrupt
    PIR1bits.RCIF = 0;    // Clear RC flag
 
    if (RCREG == 0x0D | RCREG == 0x0A)
    {
    // Place special handling for 'enter' here.
    }
 
    *recvbuf_iPtr = RCREG;    // Place recieved char into insertion location
 
    recvbuf_iPtr = recvbuf_iPtr++;                // Increment insertion pointer.
    if (recvbuf_iPtr >= recvbuf + BUFFLENGTH)
        {
        recvbuf_iPtr = recvbuf;
        }
 
    INTCONbits.GIE = 1;        // reset interrupt - clear flag etc.
}
 
void Setup(void)
{
    TXSTAbits.BRGH = 1;
    SPBRG = 25;                // Baud rate at 9600
 
    TRISCbits.TRISC6 = 0;    // PortC 6 is input
 
    TXSTAbits.SYNC = 0;        // Asynchronous mode
    RCSTAbits.SPEN = 1;        // Enable serial port
 
    // Initialise RS232 RC - with interrupts
 
    PIR1bits.RCIF = 0;        // Clear RC flag
    PIE1bits.RCIE = 1;        // Enable RC interrupt.
    IPR1bits.RCIP = 1;        // High Priority for RC interrupts
 
    RCSTAbits.CREN = 1;        // Enable RC
 
    INTCONbits.PEIE = 1;
    INTCONbits.GIE = 1;        // Enabling interrupts
 
}